Elevator door lock



Patented Oct. 28, 1941 UNITED STATES Examiner PATENT OFFICE Application June 29, 1939, Serial No. 281,789 In Germany July 2, 1938 8 Claims.

My invention relates to silent mechanical elevator door locks of the type to be opened only when the elevator car is at a predetermined position in its shaft in which a follower associated with a floating lever of the lock mechanism is disposed opposite a cam face carried by the elevator car. More particularly, my invention constitutes an improvement of the elevator lock mechanism described and claimed in my U. S. Patent One object of my invention is to provide means whereby the unlocking of the elevator door is effectively prevented, even if the elevator car is in its predetermined position in the shaft, unless the car is at rest in said position.

Another object of the invention is to make unlocking of the elevator door definitely impossible as long as the elevator car is in motion.

Still another object of my invention is to provide a single and emcient mechanism which arrests the door bolt in its locking position when the follower is brought into contact with the abutment while the latter is moving.

These and other objects which will become apparent as the specification proceeds, are accom- 26 plished, according to my invention, by the arrangement and combination of parts set forth in the following detailed description, defined in the appended claims, and illustratively exemplified in Referring to Figs. 1 to 4 of the drawings, there is mounted in the pivoted lever, which is of U- shaped cross-section. a sliding latch H the angularly bent foot |2 of which bears against a flat surface IS on the roller 0.

With the aid of a spring M which is countersupported against the hub of the pivoted lever h, and with the interposition of an angle piece l5, the sliding latch II is pressed downwards against the roller 0. Whenever the roller 0 is rotated, for instance when the cam ledge Z acts against the pivoted lever 71. when this lever is in the position shown in dotted lines in Fig. 1, the flat surface l3 lifts the head ii of the sliding latch into the path of the abutment II. The angular deflection of the roller is limited by the ends of the ledge I8. The mode of operation of the lock is extremely simple. When the pivoted lever 72. is in the vertical position (position I in Fig. 1) or deflected up to the extent of making contact with the cam ledge Z (position II), the head It of the sliding latch passes freely beneath the abutment so that the bolt 1' can be retracted by means of the latch or press-button s when the elevator is at a standstill and provided the cam ledge is in place. As soon as the elevator is set in motion and as long as it is in motion, and the roller 0 is pressed against the cam ledge, the roller 0 is rotated and the head l6 of the sliding latch is brought into a two embodiments in the accompanying drawings, position in front of the abutment so that bolt in which: I

Fig. 1 is a front elevation of one form of construction with the cover of the housing removed.

Fig. 2 is a section taken on the line AA of Fig. 1.

Fig. 3 is a section taken on the line 3-3 of Fig.

Fig. 4 is a section taken on the line C-C of Fig. 2

r can not be moved. Arresting of the bolt is also effected when the pivoted lever h is moved through the position II towards the position III, as will readily be seen from the drawings. The

looking spring 1 and the spring |4 restore the parts of the look into the position I. The pressbutton s and/or its socket are recessed, to provide improved guiding of the pivoted lever.

In the form of construction shown in Figs. 5 to Fig. 5 is a front view of amodifled form of con- 8 of the drawings a sliding stop latch 2| which struction of the elevator lock according to the invention with the cover of the housing removed. Fig. 6 is a section taken on the line D D of Fig. 5. 5

Fig. 7 is a section taken on the line EE of Fig. 5, and

Fig. 8 is a section taken on the line F-F of Fig. 6.

In both forms of construction shown in the 60 is vertically slidable on the bolt 1' is employed for arresting the bolt. The sliding latch 2| acts through a spring 22, which is accommodated in the spring housing 23, downwards against a slide 24 which is mounted in a longitudinal groove of the pivoted lever h, and presses this latter into firm contact with a flat surface 25 on the roller 0. To provide improved bearing seating, the slide 24 is bent over at the upper end at 26 and at the lower end at 21. The lower end of the sliding latch 2| is arcuate (with the centre at m), so that when the pivoted lever h is moved the bent over end of the slide 24, that is to say the end 26, slides against the end of the sliding latch 2| without moving this latter. A displacement only occurs when the roller is rotated under the action of the cam ledge when the elevator is moved, by virtue of the fact that the flat surface 25 pressegin the manner of a cam against the bentover end 2'! of the slide 24, thereby bringing the sliding latch 2| into position in front of the abutment 28, with the result that the bolt 1 can not be operated.

When the lower end surface of the sliding latch is made flat, the bent-over portion 26 acts in the manner of a cam when the pivoted lever h is moved, and lifts the sliding latch M. In this manner an additional arresting or looking action is obtainable even on simple deflection of the pivoted lever h.

The remaining parts of the lock are constructed in the manner described in my said Patent No. 2,153,765.

I claim:

1. In an elevator door lock to be opened only when the elevator car is at rest in a predetermined position in its shaft in which a follower element forming part of the lock is disposed opposite a suitable cam face carried by the car, a slidable bolt, a floating lever, means at one point of said leverengaging said bolt, a follower element for cooperation with said cam face, said follower element being retained normally in a position out of the path of the cam face, means at a second point of said lever to displace said follower toward said cam face, a door opener element, means operated by said opener element to act on a third point of said lever in such a manner that first said follower is shifted towards the path of said cam face and then, if the cam face is disposed opposite said follower and prevents further displacement thereof, the lever is swung to shift said bolt to unlocking position, said follower including an eccentric mounted for limited angular movements about its axis between two end positions, means to normally hold said eccentric in a predetermined position intermediate said two end positions, a latch to prevent shifting of said bolt to its unlocking position, and means actuated by said eccentric to shift said latch from its normal inoperative position to its operative position when said eccentric is displaced to one of said angular end positions by frictional contact with said cam face while the elevator car is in motion.

2. In an elevator door lock to be opened only when the elevator car is at rest in a predetermined position in its shaft in which a follower forming part of the lock is disposed opposite a suitable cam face carried by the car, a frame casing for the lock mechanism, said frame casing enclosing a slidable bolt, a floating lever having one end thereof pivoted to said bolt and carrying on its opposite end said follower element for cooperation with said cam face, a spring acting on said lever adjacent the pivoted end thereof to normally hold said bolt in its locking position and said follower element out of contact with said cam face, an opener slide having one end projecting from said frame casing ,nd the other and dis-- posed for action on said lever intermediate said follower element and spring in a direction opposite to that of the force exerted by the latter, said follower including an eccentric mounted on said lever for limited angular movements about its axis between two end positions, means to normally hold said eccentric in a predetermined position intermediate said two end positions. a latch mounted for movement with said bolt and slidable relative thereto in a direction different from that of the bolt movement, said latch being held normally in an inoperative position, a fixed abutment arranged for cooperation with said latch so as to prevent shifting of said latch and bolt to the unlocking position of the latter when the latch has been moved to its operative position, and means actuated by said eccentric to shift said latch to its operative position, when said eccentric is displaced to one of its angular end positions by frictional contact with said cam face while the elevator car is in motion.

3. An elevator door look, as claimed in claim 2, in which said eccentric is formed as a contact roller cut ofl on a secant, and said means to shift said latch comprises a thrust member guided along said lever and having a flat foot portion seated against the fiat cut-off surface of the roller.

4. An elevator door look, as claimed in claim 2, in which said means for shifting the latch is guided in a longitudinal groove provided in said floating lever.

5. An elevator door lock, as claimed in claim 2, in which said bolt is arranged for displacement in horizontal direction, said abutment being disposed above the path to be traversed by said bolt when it is shifted to unlocking position, and said latch comprises a head portion lying normally in a horizontal plane below the lower edge of said abutment and projecting upwardly beyond the horizontal plane of said edge when the latch has been shifted to its operative position.

6. An elevator door look, as claimed in claim 2, in which said means to shift said latch comprises a thrust member guided along said lever and having one end in contact with said eccentric, a

, spring being provided to urge said thrust member towards said eccentric.

7. An elevator door lock, as claimed in claim 2, in which said means to shift said latch comprises a thrust member guided along said lever and having one end in contact with said eccentric, the other end of said thrust member being united with said latch.

8. An elevator door lock, as claimed in claim 2, in which said latch is guided on said bolt for movement at right angles to the direction of the bolt movement, said latch having a lower surface curved on an are having its centre coinciding with the pivot axis of said floating lever, said means to shift said latch comprising a thrust member carried by and guided along said lever, said thrust memberhaving one end thereof in contact with said eccentric and its other end bearing against said arcuate lower surface of the latch. 

